Rise of the Phoenix

iTrader: (27)

Got some used headers and would like to measure so I know for sure. I searched on here, but couldn't find anything. Can you measure the diamater of one of the primaries to tell? I'm confused.

Rise of the Phoenix

iTrader: (27)

Sorry guys, posted in the wrong section by mistake.

ss1129

iTrader: (16)

Yes. I would say get a dial caliper and measure a primary.

RsSean

iTrader: (27)

Flexible tape measure.

ss1129

iTrader: (16)

LOL I guess you could just use a ruler and measure the primary opening. Thats probably easier.

sjsingle1

iTrader: (1)

get a flexible tape measure like a seamstress uses..........then get out your high school math skills and convert circumference to diameter

Isolde

iTrader: (4)

Circ / pi = dia. Pi = 3.1416.

Tony Mamo @ AFR

iTrader: (13)

Bingo....the simplest, not to mention most accurate method guys!

And if you dont own a dial caliper yet you should be banned from posting till you obtain one....LOL

Harbor freight has some nice digital ones for literally $10 in a 6" range....and they are actually decent quality btw as well.

-Tony

studderin

iTrader: (28)

use a clamp, or a big *** crescent wrench if you have one. And set them to slip over the tube. them measure the space of the jaws.

Rise of the Phoenix

iTrader: (27)

Ok, so what your saying is I can use a seamstress type tape measure, measure around the primary, take that number I get and divide it by PI (3.1416) and that will give me my answer?

Rise of the Phoenix

iTrader: (27)

See, I thougth about that too. Just measure the primary opening from side to side and that will give me my answer.

Sales2@Texas-speed

iTrader: (5)

Primary size is measured OD, not ID, so this will not work. You then have variables in tube thickness and such that this measurement will not take into account.

Dial caliper to the OD of the primary tube is the way to go!